Hydraulics ran out of oil...

[CADman_KS]

We parked our 5er on a relatively unlevel spot today, for the first time. Not that we've been out much, but we've always been on level pads.

The jacks had to extend so far to get it autoleveled, that we ran out of hydraulic fluid for the slide outs to work. Fortunately, I knew that we were only about 1/2 full in the reservoir with everything retracted. Had to add a quart to get the slide out.

Note to new owners:. Make sure that your dealer has the reservoir properly filled so you don't get stuck like we did!!

[rohrmann]

The reservoir should be filled when the jacks and slides are fully retracted. The level should be about 1/2" from the lip of the fill plug when everything is retracted.

[BiigDaddy]

I would like to add to this post, the thought that if you need to add fluid, you may want to make it the hydraulic fork oil. I replaced my factory fluid with fork oil and all the popping stopped. Just a thought.

[CADman_KS]

Originally Posted by BiigDaddy

I would like to add to this post, the thought that if you need to add fluid, you may want to make it the hydraulic fork oil. I replaced my factory fluid with fork oil and all the popping stopped. Just a thought.

Whatever came from the factory was not ATF, or was some kind of clear ATF. I was a little concerned that we should add ATF (red) when the original stuff was not.

I wonder if regular tractor hydraulic fluid would work as well? It is not red. Hydraulic fork oil is pretty thin stuff. Is it too thin???

[CADman_KS]

Originally Posted by CADman_KS

... Hydraulic fork oil is pretty thin stuff. Is it too thin???

ATF is approximately 10W according to the intraweb, and everything you read there is true.

Most fork oil is 7.5W - 15W, so they are both pretty thin. I actually run 5W in my KTM (I think factory recommend is 4W), and that stuff pours like water...

[BiigDaddy]

Originally Posted by CADman_KS

Whatever came from the factory was not ATF, or was some kind of clear ATF. I was a little concerned that we should add ATF (red) when the original stuff was not.

I wonder if regular tractor hydraulic fluid would work as well? It is not red. Hydraulic fork oil is pretty thin stuff. Is it too thin???

https://www.amazon.com/Maxima-56916-...4858695&sr=8-8

This is what I used, and its been worth the money. The popping has stopped and it keeps level when we're in one spot for a long duration.

[Desert Rat]

How much of that fork oil did you use to get all the original oil flushed out?

[CADman_KS]

Originally Posted by BiigDaddy

https://www.amazon.com/Maxima-56916-...4858695&sr=8-8

This is what I used, and its been worth the money. The popping has stopped and it keeps level when we're in one spot for a long duration.

What popping were you having?

[CADman_KS]

Originally Posted by rohrmann

The reservoir should be filled when the jacks and slides are fully retracted. The level should be about 1/2" from the lip of the fill plug when everything is retracted.

Correct, and I KNEW that ours was not at that level with everything retracted. I should have added some, but never having hydraulic jacks before, I didn't realize it was going to be that important.

Lesson learned for sure...

[masterdrago]

The documents do recommend ATF. Both in the Level Up owners manual and the Hydraulic Fluids Recommendations PDF. It's all even in the Lippert DVD that came with our 2018 3791RD.

[rohrmann]

Some will say do not mix ATF with hydraulic fluid, but ATF is hydraulic fluid with some additives and dye. Years ago, when the recommendation came out to use CAT stiction fluid or fork oil to stop the popping, I just drained some fluid from the reservoir and added the CAT fluid. Some years later, due to the original recommendation to drain and fill the fluid, I just drained what I could from the reservoir and replaced it with CAT fluid and ATF. I have never had any issues with the hydraulics with the mixed fluid. This is the link for adding stiction fluid to the system: https://lci-support-doc.s3.amazonaws...cd_0002091.pdf

[CADman_KS]

Originally Posted by masterdrago

The documents do recommend ATF. Both in the Level Up owners manual and the Hydraulic Fluids Recommendations PDF. It's all even in the Lippert DVD that came with our 2018 3791RD.

True, but that it not what the factory installs...

[ChuckS]

Having spoken with 3 different Lippert leveling system support techs they all say..

Yes.. their documents state ATF but the various factory builders tend to use AW32 fluid instead... because they buy in bulk... either is fine according to Lippert..

AW32 is slightly higher in viscosity and ATF has a bit more detergent in its mix and is a bit lower in viscosity...

I don’t run stiction fluid in my 7 year old hydraulic six point leveling system.. it pops every now and then with temp changes and that is the “nature” of the beast...

I wouldn’t worry about removing the “mix” of fluid. I’m just an old fashioned mechanic and I personally don’t mix different lubes with oring seals

YMMV

[dieselguy]

I mostly agree with ChuckS. If I had an airplane, I'd stick to fluid recommendations religiously, but our fiver's hydraulic systems are no where near as complex and finicky. I just wouldn't pour in a quart of 10/40 motor oil though. My first Montana came with clear hydraulic fluid ... my last 2 came with ATF. I and camping acquaintances have added red to clear over the years with zero issues except making the system function due to low fluid levels. The seals in our cylinders are effected by neither red or clear, nor are the hoses. Like mentioned, AFT is a bit thinner, but manufacturers now days put in whatever their purchasing agent ordered to supply the assy line at that time frame. It may have been cheaper or it may have been a "brother-in-law" deal. I've seen it happen over and over in the big volume manufacturing sector.

[CADman_KS]

Originally Posted by dieselguy

I .... It may have been cheaper or it may have been a "brother-in-law" deal. I've seen it happen over and over in the big volume manufacturing sector.

LOL on the brother in law comment. It seems like manufacturing everywhere is suffering from whatever-is-the-cheapest...

[Rick]

Room for discussion here, People. Oil is oil, and the weights are a bit different, I would say that if you want a cheap oil just go with a ten weight or lighter oil. Name brand not important. your choice. BUT if you want a good Exspenive
oil use Brake fluid, that never seems to fail. It is even used in High speed cars. and it is seal friendly, A bit cheaper is the Hyd. Jack oil, will work also. Just don't use a heavy weight oil 20w or 30w is to thick.

[Theunz]

I would not recommend brake fluid in the hydraulic system because it is hygroscopic and the hydraulic system sees nowhere close to the tempature levels of a brake system, therefore offering no benifit.